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    <title>Document</title>
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<body>
    <script>
        // 编写函数has(arr , 60) 判断数组中是否存在60这个元素，返回布尔类型
        var arr = [1, 2, 3, 60];
        var arr2 = [1, 2, 3];

        function has(a, b) {
            if (typeof a == "object") {
                for (var i = 0; i < a.length; i++) {
                    if (a[i] == 60) {
                        return "true";
                    }
                } 
                return "false";
            } 
            else if(typeof b == "object"){
                for (var i = 0; i < b.length; i++) {
                    if (b[i] == 60) {
                        return "true";
                    }
                }
            }
        }
        console.log(has(arr, 60));
        console.log(has(arr2, 60));
    </script>
</body>

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